mgb281
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| posted on 22/6/23 at 09:39 AM |
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Charcoal canister for MGB
I am gradually restoring my MGB and want to add a charcoal canister to stop the smell of petrol fumes in the garage. Installing one is not the problem
it’s what is the best way to control the purge valve.
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JAG
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| posted on 22/6/23 at 12:49 PM |
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I had a system like that on my MX-5 engine.
The system is connected with plastic tube between the main components, like this...
Fuel Tank -> Carbon-Cannister -> Purge Valve -> Intake Manifold
I think the Purge valve is closed with ignition-off and opens with ignition-on. So a simple 12v Solenoid I guess.
When you start the engine the vapour in the Carbon cannister is drawn into the intake manifold.
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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Mr Whippy
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| posted on 22/6/23 at 01:07 PM |
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quote:
Originally posted by mgb281
I am gradually restoring my MGB and want to add a charcoal canister to stop the smell of petrol fumes in the garage. Installing one is not the problem
it’s what is the best way to control the purge valve.
Even my old car does not make the garage smell even slightly of petrol. Are you sure you don't have a fuel leak!
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mgb281
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| posted on 22/6/23 at 02:12 PM |
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quote:
Originally posted by JAG
I had a system like that on my MX-5 engine.
The system is connected with plastic tube between the main components, like this...
Fuel Tank -> Carbon-Cannister -> Purge Valve -> Intake Manifold
I think the Purge valve is closed with ignition-off and opens with ignition-on. So a simple 12v Solenoid I guess.
When you start the engine the vapour in the Carbon cannister is drawn into the intake manifold.
I know exactly how they are plumber in but I needed to know how to activate the purge valve, just connecting it to the ignition switch will cause all
sorts of problems, it’s like having a vacuum leak on the manifold. I suspect it is triggered by a high vacuum on over run triggering the ECU but need
confirmation
Even my old car does not make the garage smell even slightly of petrol. Are you sure you don't have a fuel leak!
No mechanicals fitted yet, just pre emoting a possible problem and helping the atmosphere a minuscule amount.
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nick205
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| posted on 22/6/23 at 02:42 PM |
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My carb'd Pinto engined MK Indy didn't make the garage smell of petrol.
Benefit that my driveway sloped away from the garage door so I started the engine and drove straight out. Left the car roadsie while closing the the
garage door.
As Mr Whippy say I'd check it over for any leaks and to make sure everything is plumbed in correctly.
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mgb281
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| posted on 22/6/23 at 07:32 PM |
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quote:
Originally posted by nick205
My carb'd Pinto engined MK Indy didn't make the garage smell of petrol.
Benefit that my driveway sloped away from the garage door so I started the engine and drove straight out. Left the car roadsie while closing the the
garage door.
As Mr Whippy say I'd check it over for any leaks and to make sure everything is plumbed in correctly.
As I said in my last post neither the engine or fuel tank is finally fitted yet, there are no leaks or smell of petrol because the tank isn’t fitted.
All I want to know is how to trigger the purge valve without upsetting the ECU by creating a continuous air leak via the carbon canister.
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Mr Whippy
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| posted on 23/6/23 at 06:16 AM |
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quote:
Originally posted by mgb281
quote:
Originally posted by nick205
My carb'd Pinto engined MK Indy didn't make the garage smell of petrol.
Benefit that my driveway sloped away from the garage door so I started the engine and drove straight out. Left the car roadsie while closing the the
garage door.
As Mr Whippy say I'd check it over for any leaks and to make sure everything is plumbed in correctly.
As I said in my last post neither the engine or fuel tank is finally fitted yet, there are no leaks or smell of petrol because the tank isn’t fitted.
All I want to know is how to trigger the purge valve without upsetting the ECU by creating a continuous air leak via the carbon canister.
That's good, just making sure your car doesn't burn to the ground...
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JAG
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| posted on 23/6/23 at 11:50 AM |
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I'd also like to say that your car will run just fine with a permanent atmospheric vent - it's kinda how engines work 
It will be fine with the Purge Valve permanently open. So long as the carburettor/injection is calibrated correctly it won't make any difference
at all.
Just saying 
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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